guidance on the circuit analysis

Low Noise Single Supply Photodiode Amplifier

I am trying to understand the circuit shown above, with one JFET transistor at left side acting a current buffer and right hand side with a op amp.

this is a low noise transimpedance circuit,  which I think I can use or modified this circuit and used in my design, sensitive to noise and a current signal needed to be amplified to voltage signal in the end. 

the problem is that I am not quit sure how to analyse the circuit, should I use small-signal analysis? Do I need to derive the transfer function? 

why the Bandwidth is 2MHZ and where is the cut off frequency? and is the system stable or not? 

Can someone give me a clue or answer, please? 


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